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protocols(5) [mojave man page]

PROTOCOLS(5)						      BSD File Formats Manual						      PROTOCOLS(5)

protocols -- protocol name data base DESCRIPTION
The protocols file contains information regarding the known protocols used in the DARPA Internet. For each protocol a single line should be present with the following information: official protocol name protocol number aliases Items are separated by any number of blanks and/or tab characters. A ``#'' indicates the beginning of a comment; characters up to the end of the line are not interpreted by routines which search the file. Protocol names may contain any printable character other than a field delimiter, newline, or comment character. INTERACTION WITH DIRECTORY SERVICES
Processes generally find protocol records using one of the getprotoent(3) family of functions. On Mac OS X, these functions interact with the DirectoryService(8) daemon, which reads the /etc/protocols file as well as searching other directory information services to determine protocol name and number information. FILES
/etc/protocols SEE ALSO
getprotoent(3), DirectoryService(8) HISTORY
The protocols file format appeared in 4.2BSD. 4.2 Berkeley Distribution June 5, 1993 4.2 Berkeley Distribution

Check Out this Related Man Page

protocols(4)						     Kernel Interfaces Manual						      protocols(4)

protocols - Defines the Internet protocols used on the local host SYNOPSIS
/etc/protocols DESCRIPTION
The /etc/protocols file contains information about the known protocols used in the DARPA (Defense Advanced Research Projects Agency) Inter- net. Each protocol is represented by a single line in the protocols file. Each entry is of the form: Name Number Aliases The fields contain the following information: Official Internet protocol name. Protocol number. Unofficial names used for the protocol. Items on a line are separated by one or more spaces or tab characters. Comments begin with the # (number sign), and routines that search the protocols file do not interpret characters from the beginning of a comment to the end of the line. A protocol name can contain any printable character except a field delimiter, newline character, or comment character. The lines in the file appear as follows: # # Internet (IP) protocols # ip 0 IP # internet protocol, pseudo protocol number icmp 1 ICMP # internet control message protocol igmp 2 IGMP # internet group management protocol ggp 3 GGP # gateway-gateway protocol tcp 6 TCP # transmission control protocol egp 8 EGP # exterior gateway protocol pup 12 PUP # PARC universal packet protocol udp 17 UDP # user datagram protocol hmp 20 HMP # host monitoring protocol rdp 27 RDP # "reliable datagram" protocol RELATED INFORMATION
Functions: endprotoent(3), getprotobyname(3), getprotobynumber(3), getprotoent(3), setprotoent(3) delim off protocols(4)
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